The most common tachyarrhythmias in childhood are narrow QRS complex tachyarrhythmias.The Denim Shorts majority of these are supraventricular tachycardia (SVT).If electrocardiography is inconsistent with typical SVT, another underlying arrhythmia should be considered.In this case, a Womens ponchos patient with narrow complex tachycardia who was diagnosed with atrial flutter after adenosine was presented to increase awareness on the subject.